Tbayfinn - 'grandpa's gun parts' sells parts for U.S. Springfield Armory made Krags.

Your Krag is a Norwegian model and parts do not interchange and there are vast differences between Norwegian and U.S. models.

FWIW - Norwegian parts do show up on eBay and gunbroker, but, tend to be expensive. IMHO - Your Krag is too far gone to be a candidate for restoration. A more practical course would be attractive commercial sights for sport purposes.